Rotary pump



Oct. 11, 1927. I

. F. c. PETERSON 1645069 ROTARY PUMP Filed Jan, 15. 1927 3 Sheets-Sheet l 4 0 Attorney Oct. 11,1927. 69-

F- C. PETERSON ROTARY PUMP Filed Jan. 15, 1927- I 3 Sheets-Sheet 2 Inventor J? 6" Jaienww,

Attorney- Oct. 11, 1927.

ROTARY PUMP I Filed Jan. 15, 1927 3 Sheets-Sheet 3 III Inventor I 1,645,069 F. c PETERSON j? GIPeZZ'rsW v Patented Oct. 11, 1927.

UNITED STATES PATENT OFFICE.

FRANCIS C. PETERSON, OF EVERETT, \VASI'IINGTON, ASSIGNOB TO PETERSON 86 NETH- AWAY, OF EVERETT, WASHINGTON, A CORPORATION.

ROTARY PUMP.

The present invention relates to rotary pumps designed to pump either gas or liquid.

Generally, the pump comprises a cylindrical shell or casing having an inlet and an outlet and containing an eccentrically mounted cylindrical rotor with three or more isolating vanes, blades. or impellers. These impellers are carried on axle and wheel assemblies and are actuated in and out of the revolving piston by a tension ring centralized in the revolving piston thereby causing a positive action.

Provision is made for wear on the shell at the point of the contact with the piston between the intake and outlet by using a rectangular strip inserted in the shell and adjusted by set screws or the like.

Provision is also made for efficient lubrication of the wheel and axle assemblies and the blades or impellers.

The device is comparatively simple inits construction, thoroughly efficient and reliable in its operation and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawings Figure 1 is a side elevation of the pump embodying the features of this invention,

Fig. 2 is an end elevation thereof showing one of the cylinder heads removed and a portion of the shell or casing in section,

Fig. 3 is a vertical section taken substantially on the line 3-3 of Fig. 1 looking in the direction of the arrows,

Fig. 4 is a vertical section taken substantially on the line 44 of Fig. 3,

Fig. 5 is a perspective view of the tension ring,

Fig. 6 is a perspective view of one of the blades or impellers,

Fig. 7 is a perspective view of one of the wire strips.

Referring to the drawings in detail it will be seen that 5 denotes a cylindrical stator casing or shell having an outlet 6 and an inlet The outlet and inlet are disposed tangentially to the axis of the casing or shell and th is at the top thereof and the Serial No. 161,352.

latter at the bottom. This cylindrical stator casing or shell 5 is preferably mounted on a suitable supporting or pedestal structure 8 and has cylinder heads 9 and 10 which are provided with eccentric openings or bearings for rotatably receiving a shaft 11 which will be driven in any'suitable manner. On this shaft 11 and keyed thereto within the cylindrical stator casing or shell 5 is the rotor or cylindrical piston 12 having peripheral compartments 14, the bottoms or inner'surfaces of which are curved on arcs eccentric to the periphery of the cylindrical stator casing or shell 5 and and have arcuate end walls 15 and arcuate end walls 16, the latter being longer than the former and at the inner ends of the bottom surfaces and curved on larger radii. Spiders 13 are of circular formation and are provided with central openings 18 through which the shaft 11 projects and the peripheries thereof are disposed coincident with the periphery of the piston 12. These spiders 13 are provided with peripheral notches 20, the inner ends of which are arcuately curved. Axle pins 21 have wheels 22 j ournaled on their ends. These axle pins 21 extend through bores 23 provided in impellers or piston blades 24 which are shaped to fill the compartments 14. The blades or impellers 24 are provided with eccentric outer curved surfaces 25 in relation to inner curved surfaces 26 and edge curved surfaces 27 and 28 respectively, the latter edge surface being smaller than the former. The bores 23 are disposed adjacent the inner corners of the impellers 24 adjacent the edges 27 thereof. The wheels 22 are adapted to ride or bear on the interior surface of the cylindrical stator casing or shell 5 and to move in the notches 20. The spiders 13 are held in place one on each side of the rotor or piston 12.

A wear and seal strip 33 is disposed in a recess 34 and is adjusted by means of set screws 35. The recess 34 is located between the inlet 7 and the outlet 6. It is to be noted that the shaft 11 in its eccentric mounting in the cylindrical stator casing or shell 5 is disposed towards the inlet and outlet sides of the casing or shell, that is, is located closer to the wear and seal plate 33 than to the opposite diametric point of the casing or shell 5.

, When the parts are assembled as is shown Jigs. 2 and 3 to advantage; and shaft the piston rotates it will be seen thah'saitl impeller is forced into the compartment particularly by engagement'with' the "wearand seal plate .33 soas to force the fluid or air out throughthe outlet6, thus a pumping action. is set :up', A" priming plug is shown at 405315 the top of the casing or shell 5 as the casing or shell must be filled with fluid in its initial oper'ati'on if it is to be used forpumping. fl'u'id. The wheels. rise on the interior surface ofthe cylindrical stator casing or shell-5' thus minimizing friction and Wear andassuring proper operation of the imjeller's; V

' n1 order to positively urge the impellers or blades outwardly from the. compartments I4 Ifconstructthe piston 12in twoparts as is clearly shown in Fig. 4c and form between the parts thereof an annular recess a1 cone centric about the shaft It and entering the bottoms or inner portions of the compartments 14' as is clearly indicated in Figs. 2, 3 and 4:. A split tension ring. 421 is disposed in the-recess 41 and engages the surfaces 26 of the impellers 24 as is illustrated in Fig. 8 for urging the two impellers 24 remote from the wear strip 34. That is, as one of the impellers engages the wearstripto be forced into its compartment the other impellers are positively thrust out of their compartments.

Thuslit will beseen that the split ringhas a fltiating mountingin the recess 41. In each compartment 14 in the wall 6thereof, there is pr'ov'ided a pocket'fo1nreceiving a wear stiripfl l engageable with the edge curved surface 27 otthe impeller 24 located? therein. Int-the outer surface'25 of each impeller 2 f there is formed a pocket adjacent edge 2? for receiving wear. strips 46 to engage the interior? periphery of the shell or casing 5. Itis to be noted that these wear stripes-.6 are-the only portionsof the impellers that engage the shell :5. Thus practically all the Wear of-this pump is taken care of by'the wear strips 34L,4;t, and 46 which may be replaced,

"he shaft 14 has a longitudinally ext-endiiig bore 48 extending inwardly from the end'adjacent thecylinderhead 10. This ylinder head is provided with an opening 4e9"registering with thebore as so that suitable-communication maybe made witl'ila source of lubricant supply. The bores?) terminates in a. diametrically' .ntending passage 50 entering annular groovebl on the periphery of the shaft 11 within one part of the piston 12. Said part of the piston 12 is provided. with three radiating oil passages 52 the inner ends of which register with the groove 51 and the outer ends of which are closed by plugs 53. Said part of the piston12is further provided with passages 5t connected with the outer ends of the passages 52"to lead the oil to endwallsl5 of'p'ockets 14;.

Each impeller or blade 24 is provided "with V a longitudinally extending oil passage 55 one end of which is adapted to register with the passage '54 and the other endtermiiiates in the edge'27.' The passage 55'communicates intermediate its ends with the bore'23 for lubricating the axle '21.

The numerous advantages of this pump constructed in accordance with the foregoing will" be perfectly clear without further eaplanation or description and itwill al'sohe obvious that the pump will operate efficiently for the purposes desired. While the pres ent embodiment of the invention has been In a pump, a cylindrical stator casing hav- 7 ing' an outlet and: an inicttangcnti" ly disposed to its axis, cylinder heads for the casing, a cylindrical piston-in thecasing, means for rotatably mounting the piston eccentriical'ly inithe casing, saidpiston having peripheral compartments, impellers mounted in said compartments, spiders'one on oath end "of the piston and having peripheral pockets, an axle rotatably mounted in each impeller, wheels on the axles, one in each pocket, said piston'being formed intwo coinplementary; sections the abutting faces of which are formed with annular recesses entering the compartments, and: a floating split spring ring in the recesses and engaging'tl ie impellers to maintain' the wheels in contact with the interior of the-t: o

In testimony whereof I 'a-iiix my signature.

FRANCIS C. PETERSGN; 

